Chapter 13 - Current Electricity (Up to pg 229 - Resistance)

Question 1

What is electric current?

Answer 1

The amount of charge flowing through a wire per unit time (analogy - race cars in a circuit passing the start after each lap). Measured in Amps (A)

Question 2

What does mA stand for?

Answer 2

miliAmps, or 1A x 10^-3

Question 3

What type of current does not involve the flow of electrons?

Answer 3

Ones generated by the flow of ions, for example in electrolysis

Question 4

What does the area under a current-time graph represent?

Answer 4

The total amount of charge transferred

Question 5

What is the equation linking work done, potential difference and charge flow?

Answer 5

Potential difference (V) = Work done by charge (J) / Charge flow (C)

Question 6

What is the potential difference?

Answer 6

The amount of work done per unit charge flowing through a component (analogy - people with buckets of water => larger buckets = higher potential difference)

Question 7

How would 8J of energy be transferred between two resistors of 6 Ohms and 2 Ohms resistance?

Answer 7

The 6 Ohm resistor would have 6 Joules for energy pass through it, and the 2 Ohm, 2 Joules

Question 8

What is a superconductor?

Answer 8

A material whose resistance drops to 0 when it reaches below a certain temperature. This certain temperature is called the critical temperature